Ingredients
Method
- Melt butter in a pot over medium heat. Add onion and cook until soft, 5 minutes.
- Add mushrooms and garlic; cook until browned, about 6–8 minutes.
- Stir in flour and cook 1 minute. Slowly whisk in broth until smooth.
- Simmer 10 minutes. Stir in milk and tarragon; warm through but do not boil.
- Season with salt and pepper. Serve topped with croutons.